JP2005307811A - Piston insertion auxiliary device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a piston ring from coming off of a piston by being caught on the upper end opening edge of a cylinder upon inserting a repaired piston. <P>SOLUTION: A main body 2 is composed of two unit main bodies 2a, 2b formed in semicircular shapes. One-side ends of both of the unit main bodies 2a, 2b are joined through a hinge 3 so as to be openable and closable. On the other-side ends of both of the unit main bodies 2a, 2b, handles 4a and 4b are provided thereto, respectively. The inner diameter of the main body 2 is preset to a minimum reduced size, and slightly larger than the outer diameter of the piston 5. Upon inserting the piston 5 into the cylinder, the main body 2 is attached to the outer peripheral part of the piston ring, and both of the handles 4a and 4b are grasped firmly. Thereby, the outer diameter of the piston ring is reduced to the substantially equal size of the outer diameter of the piston 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a piston insertion assisting device used when a repaired piston is inserted into a cylinder from its upper end opening, and in particular, the piston ring is caught by the upper end opening edge of the cylinder and comes off from the piston. The present invention relates to a piston insertion assisting device that does not have any.

Conventionally, when inserting a repaired piston into the cylinder from its upper end opening, it is attached to the outer periphery of the piston ring to tighten the piston ring and press the piston head downward to insert it into the cylinder. In addition, a piston insertion assist device is generally known in which the piston ring is prevented from being caught by the upper end opening edge of the cylinder and coming off the piston.
ESCD convenient catalog No. 31a Issued by Esco Corporation 2000

  By the way, the conventional piston insertion assisting device is composed of a wound tubular main body formed of a thin metal sheet and a tightening means for tightening the main body to adjust the inner diameter of the main body. Even if it changes, it has the advantage that it can be handled by a single device, but on the other hand, it is structured to adjust the inner diameter of the main body with the tightening means, so the degree of tightening by the tightening means is insufficient, and the piston When the ring is caught on the top opening edge of the cylinder and the piston head is inserted into the cylinder, the piston ring may come off from the piston, or conversely, the tightening by the tightening means will be excessive and formed with a thin metal sheet. There is a problem that the main body enters the cylinder together with the piston, and it becomes impossible to remove the main body from the piston. There is a problem that.

  By the way, in the conventional piston insertion assisting device, the main body is formed in a cylindrical shape so as to be compatible with all pistons of all diameters. However, if it should be applicable to a piston of a specific diameter, the main body is wound. If it is not necessary to form the body in a cylindrical shape, and the main body does not have to be formed in a wound cylinder shape, it is expected that all the conventional problems can be solved.

  The present invention has been made on the basis of such knowledge. When the repaired piston is inserted into the cylinder from its upper end opening, the piston ring may come off from the piston, or the main body may be moved together with the piston in the cylinder. It is an object of the present invention to provide a piston insertion assisting device that does not have any inconvenience that the main body cannot be removed from the piston when it enters, and the workability can be greatly improved.

  Another object of the present invention is that the piston and crankshaft can be accurately positioned in the cylinder, and there is no need to align the piston inserted in the cylinder by rotating it around the axis after insertion. A piston insertion assisting device is provided.

  Another object of the present invention is to provide a piston insertion assisting device that has a simple structure, can be reduced in cost, and is easy to handle.

  Another object of the present invention is to provide a piston insertion assisting device that can tighten a piston ring only by gripping both handles with a light force and can further improve workability.

  Another object of the present invention is to provide a piston insertion assisting device capable of performing work by releasing a hand from both handles after the locking member is locked to the other handle.

  Still another object of the present invention is to provide a piston insertion assisting device that can obtain the same workability as that of the main body of the opening / closing structure even when both unit main bodies are structured to be completely separated.

  In order to achieve the above object, the present invention is a piston insertion auxiliary device used when a piston after repair is inserted into a cylinder from its upper end opening, and is composed of a plurality of unit bodies having an arc shape, A main body arranged in a short cylindrical shape on the outer peripheral side of the piston ring by combining the whole; gripping means for gripping the main body; and when the piston ring is tightened by bringing each unit main body close to the main body, And a tightening holding means for holding in a reduced diameter state.

  In the present invention, a positioning member is provided on the upper surface of the main body so as to match a positioning mark provided on the piston head, and a positioning pin into which a knock pin for positioning and mounting the cylinder head on the cylinder is inserted on the outer peripheral portion. It is characterized by providing.

  In the present invention, the main body is composed of two unit main bodies whose one end is connected so as to be openable and closable via a hinge, and a handle serving as a gripping means and a tightening holding means is provided on the other end of each unit main body. It is characterized in that it is provided.

  The present invention is also characterized in that an urging means for urging both unit main bodies in the direction in which the two unit main bodies approach each other is provided between the two handles.

  The present invention is also characterized in that a locking member that is locked to the other handle when the two unit main bodies are brought close to each other is provided on one handle.

  Furthermore, the present invention further comprises a main body composed of two separable unit main bodies, and when both unit main bodies are brought close to each other between both unit main bodies, the unit main bodies are connected together to constitute a tightening holding means. A connecting mechanism is provided.

  The present invention is a piston insertion assist device used when a repaired piston is inserted into a cylinder from its upper end opening, and is composed of a plurality of unit bodies having an arc shape. A main body disposed on the outer peripheral side of the piston ring in a cylindrical shape; holding means for gripping the main body; and holding the main body in a reduced diameter state when the unit main bodies are brought close to each other and the piston ring is tightened And, when inserting the repaired piston into the cylinder from its upper end opening, the piston ring may come off from the piston, or the main body may be attached to the cylinder together with the piston. There is no inconvenience that the main body cannot be removed from the piston by entering the inside, and the workability can be greatly improved.

  In the present invention, a positioning member is provided on the upper surface of the main body so as to match a positioning mark provided on the piston head, and a positioning pin into which a knock pin for positioning and mounting the cylinder head on the cylinder is inserted on the outer peripheral portion. Since the piston inserted in the cylinder and the crankshaft can be accurately positioned, it is necessary to align the piston inserted in the cylinder by rotating it around the axis after insertion. Absent.

  In the present invention, the main body is composed of two unit main bodies whose one end is connected so as to be openable and closable via a hinge, and a handle serving as a gripping means and a tightening holding means is provided on the other end of each unit main body. Since it is provided, the structure can be simplified to reduce the cost, and the handling can be facilitated.

  In the present invention, since the urging means for urging both unit bodies in the direction in which both unit bodies approach each other is provided between both the handles, the piston ring can be tightened only by gripping both the handles with a light force. Workability can be further improved.

  According to the present invention, since one handle is provided with a locking member that is locked to the other handle when both unit main bodies are brought close to each other, the locking member is locked to the other handle. Can work by releasing their hands from both handles.

  Furthermore, the present invention further comprises a main body composed of two separable unit main bodies, and when both unit main bodies are brought close to each other between both unit main bodies, the unit main bodies are connected together to constitute a tightening holding means. Since the connecting mechanism is provided, the same workability as that of the main body of the opening / closing structure can be obtained even when the structure is such that both unit main bodies can be completely separated. In addition, since both unit main bodies can be completely separated, maintenance of the inner peripheral surface of each unit main body is facilitated.

The present invention will be described below with reference to the drawings.
1 to 3 show a piston insertion assisting device according to a first embodiment of the present invention. The piston insertion assisting device 1 has a semicircular shape in which one end side is connected through a hinge 3 so as to be opened and closed. The unit 2 is composed of two unit bodies 2a and 2b, and handles 4a and 4b are provided on the other end sides of the unit bodies 2a and 2b, respectively. The inner diameter of the main body 2 is set so as to be much larger than the outer diameter of the piston 5 in the most contracted state.

  As shown in FIG. 1, the main body 2 is attached to the outer periphery of the piston ring 6 when the repaired piston 5 is inserted into a cylinder (not shown) from its upper end opening. In this state, by simultaneously grasping both the handles 4a and 4b, the piston ring 6 can be tightened to reduce the diameter, so that the piston ring 6 is caught on the upper end opening edge of the cylinder. Thus, it is possible to prevent a problem that the piston 5 comes off. That is, both the handles 4a and 4b are clamped and held to hold the main body 2 in a reduced diameter state when the piston ring 6 is tightened by bringing the unit main bodies 2a and 2b closer to the gripping means for gripping the main body 2. It serves as both means and means.

  As shown in FIG. 2, for example, the letter “F” in FIG. 2, the head portion of the piston 5 is provided with an alignment mark 7 in advance. By inserting, the circumferential position of the connecting rod 8 (see FIG. 1) taken out together with the piston 5 can be matched with the position of a crankshaft (not shown).

    4 (a) to 4 (d) sequentially show the procedure for inserting the repaired piston 5 into the cylinder 9 from its upper end opening. Hereinafter, the present embodiment will be described with reference to FIG. The operation of the embodiment will be described.

  When the piston 5 after repair is inserted into the cylinder 9, as shown in FIG. 4 (a), the piston 5 is inserted into the cylinder 9 from the connecting rod 8 side, as shown in FIG. 4 (b). In addition, the piston ring 6 is positioned directly above the upper end opening edge of the cylinder 9.

  Next, as shown in FIG. 4 (c), the main body 2 is mounted on the outer periphery of the piston ring 6, and both the handles 4a and 4b are firmly squeezed. As a result, the piston ring 6 protruding outward from the outer diameter of the piston 5 is reduced in diameter to substantially the same dimension as the outer diameter of the piston 5.

  Therefore, after gripping both the handles 4a and 4b and rotating the main body 2 around the axis so that the alignment mark 7 of the piston 5 is accurately directed to the front side, as shown in FIG. Tap the head of 5 with a plastic hammer 10 or the like. As a result, the piston 5 is smoothly inserted into the cylinder 9.

  Thus, since the piston ring 6 can be reduced in diameter by a simple operation of firmly grasping both the handles 4a and 4b, workability can be greatly improved. In addition, the inner diameter of the main body 2 is set in advance so as to be a dimension that is much larger than the outer diameter of the piston 5 in the most contracted state. There are no problems such as over-tightening or consequent shortage of tightening, and no skill is required for the work.

  In the above embodiment, the case where the main body 2 is mounted on the outer peripheral portion of the piston ring 6 at the stage shown in FIG. 4C has been described, but from the initial stage of work shown in FIG. The main body 2 may be mounted on the outer periphery of the piston ring.

FIG. 5 shows a second embodiment of the present invention, in which a spring 11 that urges the unit main bodies 2a and 2b to approach each other between the handles 4a and 4b in the first embodiment. Is provided.
Other points are the same as those in the first embodiment, and the operation is also the same.

  Since the spring 11 is provided between the two handles 4a and 4b, even if the main body 2 is attached to the outer peripheral portion of the piston ring 6 and then released from both the handles 4a and 4b, the main body 2 remains in the piston 5. The workability can be further improved, and when the diameter of the main body 2 is reduced, both the handles 4a and 4b need only be lightly gripped.

FIG. 6 shows a third embodiment of the present invention, in which one handle 4b in the first embodiment is provided with a locking hook 21 that can swing up and down, and the unit main bodies 2a, The locking hook 21 can be locked to the other handle 4a in the state where 2b is closest.
Other points are the same as those in the first embodiment, and the operation is also the same.

  Therefore, since the locking hook 21 is provided on one handle 4b, the main body 2 is fixed in the most contracted state after the locking hook 21 is locked on the other handle 4a. become. For this reason, even if the hands 4a and 4b are completely released, the main body 2 does not detach from the piston 5, and even if some external force is applied to the main body 2 in this state, the main body 2 is separated from the piston 5. There is no risk of withdrawal.

7 and 8 show a fourth embodiment of the present invention, in which the upper end surface of the unit main body 2b in the first embodiment, the alignment mark 7 of the piston 5 and the circumferential direction of the main body 2 are shown. A positioning mark 31 for aligning the position is provided, and a positioning member 33 into which a knock pin 32 for positioning and mounting a cylinder head (not shown) on the cylinder 9 is provided on the outer periphery of the unit main body 2b. .
Other points are the same as those in the first embodiment, and the operation is also the same.

  Thus, the upper end surface of the cylinder 9 is usually provided with a knock pin 32 at a predetermined position for positioning when the cylinder head is mounted on the cylinder. Therefore, if the positioning member 33 is provided in accordance with the position of the knock pin 32, the main body 2 is mounted on the outer peripheral portion of the piston ring 6 while the positions of the marks 7 and 31 are aligned, and positioning is performed in this state. By simply inserting the knock pin 32 into the member 33, the circumferential position of the piston 5 can be positioned very accurately and easily.

  9 and 10 show a fifth embodiment of the present invention, in which a main body 42 is used in place of the main body 2 in the first embodiment.

  That is, as shown in FIG. 9, the main body 42 is composed of two semi-circular completely separated unit main bodies 42a and 42b, and a positioning end face of one unit main body 42a is positioned on the butt end surface. A hole 43 is provided, and a positioning pin 44 to be inserted into the positioning hole 43 when the two unit main bodies 42a and 42b are abutted is provided on the abutting end face of the other unit main body 42b.

Further, as shown in FIGS. 9 and 10, handles 44a, 44b, 45a, 45b are respectively provided at both ends of the unit main bodies 42a, 42b, and the handles 44b, 45b is provided with locking hooks 46 and 47 that can swing up and down, respectively, and when both the unit main bodies 42a and 42b are brought into contact with each other, both the locking hooks 46 and 47 are attached to the other unit main body 42a. Each handle 44a, 45a can be locked. As a result, a completely integrated main body 42 can be obtained.
Other points are the same as those in the first embodiment, and the operation is also the same.

  Thus, even when the main body 42 is constituted by two completely separated unit main bodies 42a and 42b, the same effects as those of the main body 2 of each of the foregoing embodiments of the opening / closing structure can be obtained.

  In each of the above-described embodiments, the case where the main bodies 2 and 42 have a two-divided structure has been described as an example. However, the same effect can be obtained even if the divided structure has three or more divided structures.

  As described above, the piston insertion assisting device according to the present invention is useful as a device that is used when the repaired piston is inserted into the cylinder, and in particular, the piston ring is hooked on the upper end opening edge of the cylinder and is separated from the piston. It is suitable as a device for preventing it from coming off.

It is sectional drawing which shows the piston insertion assistance apparatus which concerns on the 1st Embodiment of this invention. It is a top view of FIG. It is a left view of FIG. (A)-(d) is explanatory drawing which shows the method at the time of inserting a piston in a cylinder in order according to a procedure. FIG. 3 is a view corresponding to FIG. 2 showing a second embodiment of the present invention. FIG. 9 is a view corresponding to FIG. 2 showing a third embodiment of the present invention. FIG. 9 is a view corresponding to FIG. 2 showing a fourth embodiment of the present invention. FIG. 8 is a bottom view of FIG. 7. FIG. 9 is a view corresponding to FIG. 2 showing a fifth embodiment of the present invention. It is explanatory drawing which shows the state which united and united both unit main bodies of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Piston insertion auxiliary device 2,42 Main body 2a, 2b, 42a, 42b Unit main body 3 Hinge 4a, 4b, 44a, 44b, 45a, 45b Handle 5 Piston 6 Piston ring 7 Alignment mark 8 Connecting rod 9 Cylinder 10 Plastic hammer 11 Spring 21, 46, 47 Locking hook 31 Positioning mark 32 Knock pin 33 Positioning member 43 Positioning hole 44 Positioning pin

Claims (6)

  This is a piston insertion auxiliary device used when inserting the repaired piston into the cylinder from its upper end opening. It is composed of a plurality of arc-shaped unit bodies that are combined into a short cylindrical shape. A body disposed on the outer peripheral side of the piston ring; gripping means for gripping the body; tightening and holding for holding the body in a reduced diameter state when the unit body is brought close to and the piston ring is tightened And a piston insertion assisting device.   The main body has a positioning mark on the upper surface thereof that matches a positioning mark provided on the piston head, and a positioning member into which a knock pin for positioning and mounting the cylinder head to the cylinder is inserted into the outer peripheral portion. The piston insertion assisting device according to claim 1, further comprising:   The main body is composed of two unit main bodies whose one end is connected to be openable and closable via a hinge, and each unit main body has a handle serving as a gripping means and a tightening holding means on the other end. The piston insertion assisting device according to claim 1 or 2, characterized in that   4. The piston insertion assisting device according to claim 3, wherein biasing means for biasing both unit main bodies in a direction in which both unit main bodies approach is provided between the two handles.   4. The piston insertion assisting device according to claim 3, wherein one handle has a locking member that is locked to the other handle when both unit main bodies are brought close to each other.   The main body is composed of two separable unit main bodies, and there is a coupling mechanism between the two unit main bodies that connects the unit main bodies together when the two unit main bodies are brought close together to form a tightening holding means. 3. The piston insertion assisting device according to claim 1, wherein the piston insertion assisting device is provided.

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